From: Peter Kingston (kingstonp.ccie@gmail.com)
Date: Tue Sep 25 2007 - 10:53:16 ART
Hello Sergey
What Is the IGP running between R3 and R4?
-- Regards,Peter Kingston Studying my CCIE
On 9/25/07, Sergey <public@svlp.net> wrote: > > There are two routers in AS300 with enabled synchronization, both router > have bgp peering with as 100. > > R1(as100) --- R3(as300) --- R4(as300)---R2 (as100) > > The restriction says that R4 should prefer R3 for any external routes, so > I simply set on R4 weight = 2000 to R3. > But I've discovered one moment. If session between R4 & R3 comes first, > everything works fine. But if > session between R4 & R3 comes after R4 & R2 session than R4 thinks that > routes from R3 are > not synced (because no IGP routes in routing table) and prefer routes from > R2 in spite of that R3 has weight = 2000. > > R4(config-router)#do sh ip bgp 70.70.70.0 > BGP routing table entry for 70.70.70.0/24, version 6 > Paths: (2 available, best #2, table Default-IP-Routing-Table) > Flag: 0x960 > Advertised to update-groups: > 1 2 > 100 700 > 172.16.36.6 (metric 20) from 172.16.34.3 (172.16.103.1) > Origin incomplete, metric 0, localpref 100, weight 2000, valid, > internal, not synchronized > 100 700 > 172.16.124.1 (metric 64) from 172.16.124.5 (172.16.102.1) > Origin incomplete, localpref 100, valid, external, best > > I want that R4 always select routes from R3 in spite of what session comes > first. What is the best way to accomplish it? > > _______________________________________________________________________ > Subscription information may be found at: > http://www.groupstudy.com/list/CCIELab.html
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